Measurement of Ξ-/Ξ̅+ production in jets from Z boson decays with the DELPHI open data
Abstract
The production rates of Ξ−/Ξ̅+ baryons in energy-ranked jets produced in Z→hadrons decays are measured using $3.2$ million hadronic Z events recorded by the DELPHI experiment. Jets are reconstructed using the Durham algorithm with ycut=0.005. Quark- and gluon-enriched jet samples are obtained by ranking the jet energies in three-jet events. The softest jet are found to produce fewer Ξ−/Ξ̅+ and less energetic baryons than the other jets. The ratio of Ξ−/Ξ̅+ production rates in gluon and quark jets, each normalized to the corresponding mean charged-particle multiplicity, is measured to be 1.21 ± 0.18 (stat.) ± 0.26 (syst.). The result is consistent with the JETSET expectation and the OPAL measurements of KS0 and Λ productions in Z decays. This study presents the first measurement of the gluon-to-quark production ratio for baryons containing two s quarks, providing new insights into strange-quark production and hadronization. Future e+e− colliders such as CEPC and FCCee will provide much larger Z-boson samples and will allow far more precise studies of the subject.
Versions
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BibTeX
@misc{fan2026measurement,
title = {{Measurement of $Ξ^-/\barΞ^+$ production in jets from $Z$ boson decays with the DELPHI open data}},
author = {Zhouyue Fan and Yuzhi Che and Xinchou Lou and Zhaoru Zhang and Jinfei Wu and Gengyuan Zhang and Gang Li and Yanping Huang and Manqi Ruan},
howpublished = {arXiv},
year = {2026},
month = aug,
doi = {10.48550/arxiv.2607.13804},
eprint = {2607.13804},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2607.13804},
}
RIS
TY - UNPB
TI - Measurement of Ξ^-/Ξ̅^+ production in jets from Z boson decays with the DELPHI open data
AU - Zhouyue Fan
AU - Yuzhi Che
AU - Xinchou Lou
AU - Zhaoru Zhang
AU - Jinfei Wu
AU - Gengyuan Zhang
AU - Gang Li
AU - Yanping Huang
AU - Manqi Ruan
PY - 2026
DA - 2026/08/03
PB - arXiv
DO - 10.48550/arxiv.2607.13804
UR - https://arxiv.org/abs/2607.13804
AB - The production rates of Ξ^−/Ξ̅^+ baryons in energy-ranked jets produced in Z→hadrons decays are measured using $3.2$ million hadronic Z events recorded by the DELPHI experiment. Jets are reconstructed using the Durham algorithm with y_cut=0.005. Quark- and gluon-enriched jet samples are obtained by ranking the jet energies in three-jet events. The softest jet are found to produce fewer Ξ^−/Ξ̅^+ and less energetic baryons than the other jets. The ratio of Ξ^−/Ξ̅^+ production rates in gluon and quark jets, each normalized to the corresponding mean charged-particle multiplicity, is measured to be 1.21 ± 0.18 (stat.) ± 0.26 (syst.). The result is consistent with the JETSET expectation and the OPAL measurements of K_S^0 and Λ productions in Z decays. This study presents the first measurement of the gluon-to-quark production ratio for baryons containing two s quarks, providing new insights into strange-quark production and hadronization. Future e^+e^− colliders such as CEPC and FCCee will provide much larger Z-boson samples and will allow far more precise studies of the subject.
ER -